fiberglass and foam

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smgreen20

Member - Posts: 36

Joined: October 11, 2006

Location: United States

Posted: August 19, 2007 at 9:26 PM / IP Logged

In about 10 hrs I'm going to start on a 3rd version of door pods for my truck. This time around I'm going to use expandable foam and cover that w/fiberglass/resin. I know I'm going to have to seperate to foam and resin from each other so the resin doesn't eat the foam. So my Q is to those that have done so. How'd you do it? I'm going to do a few trial runs changing something different every time. I might even try no resin/glass, just body filler. Who knows????? Do you?

bellsracer

Silver - Posts: 703

Joined: January 14, 2006

Location: United States

Posted: August 19, 2007 at 11:29 PM / IP Logged

I would use heavy duty foil on the foam to keep a barrier, use the shiny side on the outside. I would also apply several coats of mold release to the form to help ease the removal of the resin. (If it gets desperate, consider using Spray PAM as an alternative; not the best, but better than nothing)

As for the idea of just body filler, the overall structure will be very weak for it's weight. Body filler was never intended to be used for structural purposes, just to smooth out uneven-ness. Use the glass and resin for the primary structure, then body filler to smooth that out.

Please do not hesitate to ask any more questions

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dpaton

Copper - Posts: 141

Joined: July 19, 2004

Location: United States

Posted: August 29, 2007 at 9:55 PM / IP Logged

smgreen20 wrote:

This time around I'm going to use expandable foam and cover that w/fiberglass/resin.

Don't. Use pink or blue foam instead. The expandable doodie is just that, doodie. It's soft, flexiible, ,shrinks, melts with some epoxy formulations, and is generally a pain in the ass.

Foam and 'glass is a good combo. It's good enough for airplanes. Just make sure you use the right foam.

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silent bob

Member - Posts: 16

Joined: January 11, 2007

Location: United States

Posted: August 30, 2007 at 11:05 AM / IP Logged

dpaton wrote:

smgreen20 wrote:

This time around I'm going to use expandable foam and cover that w/fiberglass/resin.

Don't. Use pink or blue foam instead. The expandable doodie is just that, doodie. It's soft, flexiible, ,shrinks, melts with some epoxy formulations, and is generally a pain in the ass.

Foam and 'glass is a good combo. It's good enough for airplanes. Just make sure you use the right foam.

On the other hand, if you're using polyester resin, it will dissolve the pink/blue builders foam. Be sure to test your resin/foam combination before you try anything significant...

the part came out once

therefore it must go back in

where is that hammer

bagged_xb

Member - Posts: 24

Joined: May 25, 2007

Location: United States

Posted: September 01, 2007 at 8:21 PM / IP Logged

where do you get the mold release, and what is the maufacturers name

dpaton

Copper - Posts: 141

Joined: July 19, 2004

Location: United States

Posted: September 03, 2007 at 8:22 PM / IP Logged

bagged_xb wrote:

where do you get the mold release, and what is the maufacturers name

Ask Google. There are many manufacturers and sources.

I buy mine from Fiberglast

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Sessland

Copper - Posts: 58

Joined: July 02, 2005

Location: Mexico

Posted: September 10, 2007 at 1:53 PM / IP Logged

bagged_xb wrote:

where do you get the mold release, and what is the maufacturers name

I use cheap car wax for my mold release. Works fine, cheap and you can find it anywhere.

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fiberglass and foam

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